Evolution and phosphorus fractionation in saline Spolic Technosols flooded with eutrophic water

Purpose The aim of this study was to evaluate the behaviour of P in saline Spolic Technosols flooded with eutrophic water, with and without plant rhizosphere, in order to assess the role of these soils as sinks or sources of this nutrient. Materials and methods Samples were taken from basic (pH ~7.8), carbonated and acidic (pH ~6.2), de-carbonated soils of salt marshes polluted by mine wastes. Three treatments were assayed: pots with Sarcocornia fruticosa, pots with Phragmites australis and pots without plants (bare soil). The pots were flooded for 15 weeks with eutrophic water (PO4 3− ~6.92 mg L−1 ) and pH, Eh and water-soluble organic carbon and PO4 3− concentrations were monitored in the soil solution. A soil P fractionation was applied before and after the flooding period. Results and discussion The PO4 3− concentration in the soil solution decreased rapidly in both soils, with and without plant, being diminished by 80–90 % after 3 h of flooding. The Fe/Mn/Al oxides and the Ca/Mg compounds played an important role in soil P retention. In pots with S. fruticosa, the reductive conditions due to flooding induced P release from metal oxides and P retention to Ca/Mg compounds. In turn, P. australis may have favoured the release of P from carbonates, which was transferred to Fe/Mn/Al compounds. Conclusions The retention of P by the soil was the main mechanism involved in the removal of PO4 3− from the eutrophic flooding water but to evaluate the capacity of these systems as long-term P sinks, the combined effect of metals, Ca/Mg compounds and specific plant species should be considered.

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González Alcaraz M.N. Álvarez Rogel J. Cervantes A.M. Egea C. y Conesa H.M. Evolution and phosphorus fractionation in saline Spolic Technosols flooded with eutrophic water. Springer Nature, 2012. https://doi.org/10.1007/s11368-012-0566-1

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Resource type Article
Date of creation 2024-11-05
Date of last revision 2024-11-05
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Metadata identifier 92b11f8c-c888-566d-be11-f6d6a7c0456c
Metadata language Spanish
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High-value dataset category Earth observation and environment
ISO 19115 topic category biota
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Name of the dataset creator González Alcaraz, M.N., Álvarez Rogel, J., Cervantes, A.M., Egea, C. y Conesa, H.M.
Name of the dataset editor Springer Nature
Other identifier DOI: 10.1007/s11368-012-0566-1
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Email of the dataset creator nazaret.gonzalez@upct.es
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